As a comparison, I don't know if much of Google's data ever leaves Google.
Of course it is, and of course they don't. There are exactly two reasons why stuff like cars or kettles get connected to the Internet:
1) A value-add gimmick to justify a price hike on what's pretty much a commodity product;
2) A way to lock you into paying (with money or data) for a cloud service, using a physical appliance as an anchor.
Actual utility of an Internet-connected appliance doesn't even enter the picture.